Philip:* Door #3:** We have done this many times.* Hobo and our last boat had and have cored hulls and we have replaced*and installed transducers and thru-hulls.
On Hobo, where the coring stops, in relation to the keel prevents any mounting of a transducer.
Just think, how many people get to drill a 1-2" hole through the bottom of their boat below the water line (on the hard).*